Mechanism for corrugating and indenting plastic sheet material



Feb.6,1923. v 11,444,395

' W. R. SEIGLE MECHANISM FOR CORRUGATING AND INDENTING PLASTIC SHEET MATERAL FILED 001'. 5. I92] 2 EEEE TS'SHEET .I

iv avmibf Feb, 1 923. I 11,444,395-

w. R. SIEIGLE MECHANI SM FOR CORRUGATING AND INBENTING PLASTIC SHEET MATERIAL Patented Feb. 6, 11923. v I it I arren stares earaur caries.

WILLIAM R. SEIGLE, OF NEW YORK, N. Y.

MECHANISM FOR CORRUGATING INDENTING PLASTIC SHEET MATERIAL.

Application filed October 5, 1921. Serial No. 505,532.

T allwhom it may concern: method is peculiarly adapted to deal, this Be it known that I. lVILLIAM R. Snienn. material will be herein referred to, as a type. a CliIlZn of the United States of America, Insulating material has heretofore been and resident of New York city, in the made and used. consisting of acorrugated 0 county of New York and State of New sheet of asbestos paper. adhesively secured York, have invented new and useful 1mto an uncorrugated covering sheet of the provements in Mechanism for Corrugating same material. as by sodium silicate. The and Indenting Plastic Sheet Material, of air spaces formed by this assemblage of Which the following is av specification. sheet members are long channels, between 65 10 My invention relates to the manufacture the corrugated surfaces of one member and of heat insulating materials, and consists the plain surface of the other, and the rela of a mechanism by which a sheet-member tively great length of these channels peradapted to be incorporated in a heat-insumits more air circulation and consequent lating structure, and comprising features convective transfer of heat, than is desir- 70 which contribute cellular construction to the able. To improve this condition, I have incompleted structure, may be economically vented a new heat insulating material, exand expeditiously manufactured. emplified in its elements by the structure The ultimate object to which this inven shown in Fig. 1 in which the corrugations tion is contributory, is the formation of a of a sheet of asbestos paper, or other suit- 75 2O cellular sheet comprising a corrugated and able material, are indented from .opposite indented sheet-member of material having 'sides, inalternate rows transverse to the the characteristics of asbestos paper, and a corrugations, so that, when joined to covcovering sheet, preferably of similar maering sheets, these corrugated and indented terial; the members of which are so constisheets provide means for producing a large 80 tuted and assembled that the corru ations number of relatively small, mutually isoand indentations of one member proc uce, in lated, air cells. conjunction with the other member, anas- The corrugated and indented sheet is ilsemblage of mutually isolated air-containing lustrated in Figs. 1 and 2,-and designated cells. by the letters S. The oppositely presented 85 The mechanism herein described is an'incrests of the corrugations, C and H, are strunient wherewith a method (invented by transversely indented from opposite sides, me and forming the subject matter of an apas at I and 1, these indentations being im plication for United States Letters Patent, pressed into the corrugated material prefserially numbered 505,533) may advantaerably so that the bottom of each indenta- 90 geously 'be practised; and the cellular heat tion is flush with the crests of the corrugainsulating material, in which the product of tions on the side toward which the indentathe said method is a. component member, is tion is made. Thus, when covering sheets, as also the subject matter of an application for S are secured to the corrugated and in- United States Letters Patent, serially numdented sheet S, theside-walls of the corru 95 40 bered 505,534, filed by me concurrently heregations, the end walls produced by the inwith. dentations, and the surface of the covering In the drawingshereto annexed, which ilsheet constitute enclosing walls, and produce lustrate my invention: a cellular construction in the entire sheet.

Figure'l shows a composite cellular sheet To serve their intended uses fully, such we of insulating material; sheets must be susceptibleof being bent or I Figure 2, the corrugated and indented wrapped around curved-surface bodies, such member of the sheet shown in Figure 1; as steam pipes. The bending cannot prac- Figure 3, a. pair of sheet-corrugating and tically be effected except 'in surfaces of indenting rolls, in side elevation, adapted curvature transverse to the corrugations: the 105 to form the sheet member shown in Figure indentations, each being practically isolated, 2; and I do not sensibly interfere with the bending Figure 4 is an end elevation of said rolls. of the sheet as a whole. As asbestos paper is the preferred ma- Material, like asbestos paper. which in its terial for fabricating the heat-insulating mafinal condition is sutliciently rigid in con- 11c) terial by the herein described method, and stitution to retaln a corrugated form, does presents characteristics With which the said not readily or practically yield to-such treatment as indentation after the corrugated sheet is dried and set, or indeed, after the -corrugations have been formed, unless the material be held and supported between corrugated matrices while the indentations are impressed into it.

By preference, I perform my method by simultaneously corrugating and transversely indenting a plastic sheet of asbestos .paper, so that the instruments of corrugation contribute the support to the plastic material, necessary to confine the effect of indentataion tothe intended restricted region. A mechanical instrument by which my method can be effectively practised, is illustrated in Figs. 3 and 4, where R, R are top and bottom rolls, corrugated, adapted to intermesh, proper clearance for material, and impress the material with corrugations. These rollsare shown as separated one from the other: in practice they will inter-mesh.

At predetermined intervals the faces of the rolls are circumferentially grooved, at

G and G. The grooves G of one roll register with grooves G of the other; grooves G are cut with a plain cylindrical bottom, Whereas grooves G contain each an annular bead B, spaced from thesides of the groove. \Vhen the rolls are meshed, the tops of the beads B are spaced slightly from the bottom of grooves G.

With the rolls R, R, in mesh, pass a sheet of wet asbestos paperbetween them, preferably taking the paper in the green state as it comes from the paper machine. The paper, in this plastic condition, is flexed into corrugations between the corrugating teeth T, T of the rolls 'R, R, while each bead B presses down and indents the crowns of the corrugations, from one side or the other of the paper. As the beads B do this work, the corrugations are securely supported on each side of each groove G, so that the indentation of the corrugations does not disturb for distort the side.

Furthermore, the simultaneous operation of the corrugating teeth and indenting beads, upon the plastic asbestos paper, is gradual. progressing from the initlal engagement of with corrugations at either the teeth and beads with the sheet, to the stage Where the corrugating teeth of both rolls are in full mesh with each other. Thus, as the indenting action, and requirement of adjacent support, progresses, the support afforded by the corrugated surfaces of the rolls progresses likewise.

Preferably, and as here shown, alternate grooves in each roll contain the beads B, so that the completed sheet has its corrugations indented in alternate rows, from opposite sides of the sheet. After being passed through the rolls, the sheet is allowed to set and harden, and is then ready to receive a covering sheet, such as S, on either or both sides. \Vhen, as in Fig. 1, a single covering sheet is used, this serves to cover both sides of the corrugated sheet if the whole structure be wrapped spirally around a cylindrical object, such as a steam pipe.

A mode ofoperation which I have found effective is to take asbestos paper and heat or steam it if it be already moist or steam it, if dry, until it is moist. The paper thus rendered plastic and hot is then passed through rolls such as prescribed herein, the rolls being also heated as by steam in the wellknown manner.

WVha-t I claim anddes-ire to secure by Leters Patent is:

1. Mechanism for corrugating and indenting plastic sheet material, comprising longitudinally corrugated, intermeshing rolls, each having circumferential, mutually registering grooves, and material-indenting beads projecting from the bottoms of grooves of one roll into the grooves of the other.

2. Mechanism for c-orrugating and indenting plastic sheet material, comprising longitudinally corrugated, intermeshing rolls, each having circumferential, mutually registering grooves, and material-indenting beads projecting from the bottoms of grooves of one roll into the grooves of the other alternately.

Signed by me at New York city, N. Y.,

this23rd day of September, 1921.

WILLIAM R. SEIGLE. 

